Abstract
A calorimetric study of natural pyromorphite Pb5[PO4]3Cl was performed. Its enthalpy of formation was determined by melt solution calorimetry from elements ΔfHel∘(298.15 K) = −4124 ± 20 kJ/mol. Value ΔfGelo(298.15 K) = −3765 ± 20 kJ/mol was calculated.
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